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High-efficiency, large-bandwidth silicon-on-insulator grating coupler based on a fully-etched photonic crystal structure

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4 Author(s)
Liu Liu ; Department of Photonics Engineering, DTU-Fotonik, Technical University of Denmark, Ørsteds Plads Bldg. 343, 2800 Lyngby, Denmark ; Minhao Pu ; Yvind, K. ; Hvam, J.M.

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A grating coupler for interfacing between single-mode fibers and photonic circuits on silicon-on-insulator is demonstrated. It consists of columns of fully etched photonic crystal holes, which are made in the same lithography and etching processes used for making the silicon-on-insulator wire waveguide. The holes have a diameter of around 143 nm, and are defined with electron-beam lithography. A peak coupling efficiency of 42% at 1550 nm and 1 dB bandwidth of 37 nm, as well as a low back reflection, are achieved. The performance of the proposed fully etched grating coupler is comparable to that based on the conventional shallowly etched grating, which needs additional fabrication steps.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 5 )